CODEWITHSUNDEEP
cstringstring-concatenation
ingh.am
ingh.am

Reputation: 26812

Concatenate two char arrays?

If I have two char arrays like so:

char one[200];
char two[200];

And I then want to make a third which concatenates these how could I do it?

I have tried:

char three[400];
strcpy(three, one);
strcat(three, two);

But this doesn't seem to work. It does if one and two are setup like this:

char *one = "data";
char *two = "more data";

Anyone got any idea how to fix this?

Thanks

Upvotes: 16

Views: 33718

Answers (3)

OverloadedCore
OverloadedCore

Reputation: 11

You can easily use sprintf

char one[200] = "data"; // first bit of data
char two[200] = "more data"; // second bit of data
char three[400]; // gets set in next line
sprintf(three, "%s %s", one, two); // this stores data

Upvotes: 0

EricSchaefer
EricSchaefer

Reputation: 26370

strcpy expects the arrays to be terminated by '\0'. Strings are terminated by zero in C. Thats why the second approach works and first does not.

Upvotes: 4

Martin Ingvar Kofoed Jensen
Martin Ingvar Kofoed Jensen

Reputation: 4311

If 'one' and 'two' does not contain a '\0' terminated string, then you can use this:

memcpy(tree, one, 200);
memcpy(&tree[200], two, 200);

This will copy all chars from both one and two disregarding string terminating char '\0'

Upvotes: 8

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